API SDK Login after Atlassian Account change

[Hugo Canal]

We had implemented TechTalk JIRA SDK to create issues from our custom system into JIRA automatically and it stopped working when the rollout of the new Atlassian Cloud account was done on May 15th. It can't authorize, it returns a 401 on the response, I tested yet another library called Dapplo.JIRA and it also fails to authenticate using basic AUTH.

Is there any setting I should be tweaking to make this work again? I understand you made changes to the REST API but now this libraries have been rendered useless and I have to write the API consumer manually which is ton of wasted time for a system that was perfectly working before.

Thanks