Data refresh through PBI Gateway keep prompting credential missing incorrectly

We are having exactly same issue, since I made changes to the Power BI Desktop files from Monday 24/08/2020 onwards, I made changes to files on Saturday 23/08/2020 and it was all good updating on the service. I did a lot of testing like:

1. Change the file name and upload on Service - Fail.
2. Upload on another workspace - Fail.
3. Upload from another user - Fail.
4. Update to latest August Power BI software (2.84.861.0 64-bit) and upload - Fail.
5. Extra a previous version of the Power BI desktop file which is 23/08/2020 or prior and upload - Success.
6. Use the 23/08/2020 or prior desktop version file, upload on service and then make visual changes on the service and save it - Success.

We extracted the previous version files from 23/08/2020 or prior depnding on when was last saved (4 Power BI reports which we have made changes yesterday 24/08/2020) and upload them on to the service and make the visual changes directly and it is fine for now.  But the big problem is I cannot add any new data source or make any visual changes on the desktop file, as soon as I make changes on desktop file and upload on the server it fails to refresh.

I logged a Microsoft Support Ticket yesterday 24/08/2020 and a support enginner got in touch with me and we screen shared the issue, we are going to have a meeting with the Microsoft engineer in an hour again and will see what they have to say about it.

Will keep you guys posted, I have also asked the engineer to take a look at this post and told him that it's just not me there are other who have the same issue.