Uh oh! There was an error adding Trello to Slack.

[Kenneth Kron]

Whenever I attempt to add the Trello app to slack I end up at the following URL

https://trello.com/integrations/add-to-slack-error

Uh oh! There was an error adding Trello to Slack.

If I go to the members section of Trello and try to add Slack integration I get the same result no details anywhere.

[Richard Bramwell]

Revoking worked for me however not in the way I thought, as I have several Trello administrators on my Trello Workspaces.

The good news is it cleared down the blockages and using the original Trello Administrator account I was able to link several boards ( not sure if there is an upper limit) 

I hope tis helps

[Duc Do Xuan]

I get same issue as people above. Although I use some difference browsers: microsoft edge, chrome, safari and also use incognito mode but still got same error without any reason. 

[Koos]

I was experiencing the same problem and found that I couldn't connect the integration in Firefox. Not even with Enhanced Tracking Protection and uBlock Origin disabled. Using Chrome, the instructions above worked.

[Garrett]

Hi everyone!

We've had a few users report that the issue only occurred in a specific browser and switching to another helped them authorize successfully. Specifically, Brave's shield feature seems to be breaking the authorization, although the issue could be a similar ad-blocker feature in other browsers.

If you're still experiencing trouble, I'd suggest giving these troubleshooting steps a try:

First, check if your browser is fully up to date: What browsers and mobile platforms does Trello support?

After confirming you're on the latest version, try authorizing the app following each of the steps below:

• Disable all extensions and customizations in your current browser
• Try using Incognito or Private browsing mode
• Try using a different browser on the same computer
• Try using a different computer

When trying to authorize the app, please use the steps Lara shared previously:

1. In Slack, type in the command /trello unlink and /trello reset.
2. Go to your Workspace page in Trello
3. Scroll down to the Slack linking section
4. Select Add to Slack
5. Follow the authorization steps

If the issue persists, send us a message over at https://trello.com/contact and we'll be happy to take a closer look with you. Just be sure to include what browser and OS version you attempted this with.

[Yad Ghavi-Helm]

Hello,

I have the same issue, and it didn't resolve after following your suggestions.

I'm using Firefox - could this be the issue?

Yad

[Lara]

Hi Kenneth,

Thanks for reaching out!

Let's try starting with a clean slate to see if that helps get Slack working again. Would you mind trying the following steps for me please?

1. Go to the board where this Power-Up is enabled.
2. Open the Board Menu and select the Slack Power-Up.
3. Select Remove personal settings and Disable the Power-Up.
4. Go to https://trello.com/my/account
5. Under the Applications section, select Revoke under any entries for Slack (if any are found).
6. In Slack, type in the command /trello unlink and /trello reset and reauthorize your account.

After that, go ahead and reenable the Slack Power-Up and follow the authorization flow. Could you let me know how that goes please?

I'll keep an eye out for your reply,

Lara
The Trello Team

[박성원]

i have same trouble with slack power-up.

and i have done all of that you recommended.

but nothing's change. 

still every time i add slack team in trello, it ends up with 

https://trello.com/integrations/add-to-slack-error

i need profer help.

[Lara]

Hi there,

Could you please go to your Workspace settings page and unlink the Slack team?

If there is no Slack team linked, please click Add to Slack:

If the issue persists, please reach out at https://trello.com/contact and we can take a closer look.

All the best,

Lara
The Trello Team

[vincent]

Hi Lara,

I get the same issue as the people above. I followed your latest instructions but still get the same error:

https://trello.com/integrations/add-to-slack-error?error=State-Check-Failed

This error also showed when unlinking the authorized Slack workspace and then trying to link again.

Thanks,

[Lara]

Hi Vincent,

Are you able to link the Slack team via your Workspace settings page?

 

If not, please reach out via https://trello.com/contact so we can take a closer look. Thanks!

Lara
The Trello Team

[vincent]

Hi Lara,

Unfortunately, I get the same error page and message as above when I click on the 'Add to Slack' button:

I guess I'll trying contacting your support through the link you provided above then.

Vincent

[vincent]

Hmmm actually the link you provided https://trello.com/contact seems to be broken too...

[vincent]

OK I found the culprit in my case ! 

I switched to the Brave browser recently, which is based on Chrome, but has some tweaks to block some requests that it deems inappropriate. 

Out of curiosity I switched back to the Chrome browser to try adding Slack, and this time it worked.

Hope this helps other people,

Vincent from Vnited

[Garrett]

Hey @vincent thanks for the update! I saw a similar report from someone using Brave and they were able to successfully connect Slack by using another browser temporarily.

I'll share another comment suggesting some browser troubleshooting steps for other affected users.