How to fix the issue unable to log in Bitbucket

[KI]

I tried to access Bitbucket through my Atlassian home page, but I couldn’t log in.
The error message says:

We couldn’t log you in

You may run into this issue when you use specific browsers or add-ons that hide the referer header for id.atlassian.com and other Atlassian sites. Check for these and then try logging in again.

Could anyone help me figure out and fix this issue?

[Brant Schroeder]

@KI 

1. Do you have one Atlassian account? 
2. If yes is that account managed by your company? 
   1. If yes can you confirm that you have access to that app?
   2. If no are you the admin on your instance?
      1. If yes have you setup BitBucket?