Few days ago, everything was working fine.
However, now when my colleagues enter data into the Person or Group Type field via a custom PowerApps form, the data is not being saved in the SharePoint list. As the field is a required field, it is only showing required info.
On the other hand, I being the creator of the custom PowerApp form, don't have this issue.
For your information, I have even tried to use MS Flow to manually update the sharepoint list, but it still didn't work. In addition, I have tried to create a new Person field in PowerApps form, which also had the same issue. I have also provided the full control SharePoint premission to my colleague, and it still didn't fix the problem.
Hence, please help me to fix this problem, this system was supposed to launch tomorrow.