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I solved the problem folks.
I had the same problem, I even wrote in this article, unfortunately I could not get support from any microsoft expert...
The problem was the same as you guys experienced, only the only difference is that when I left my old company and switched to my new company, the problem started after I deleted my old teams account and added a new one, so I mean, the start of the problem may be different, but the problem is the same.
How did I solve it?
I have contacted Apple support and the solution I will suggest will definitely be valid for apple phones.
For Iphone
>>>Settings > General>Transfer or Reset iPhone > Reset > Reset All Settings
In this reset process, none of your data is lost, your images, phonebooks, etc. are all there, but simple personalizations such as cookies and alarms are reset and you will need to set them up again...