Hello!
After several days in contact with Microsoft Support, synchronization was disabled and now I find the possibility to resume it.
I am going to leave you a tip that has been confirmed for me and I hope it will serve all those who are going through a situation like this:
If the process takes 72 hours and remains in the same state (72 hours that are actually listed in the Microsoft documentation), and this has been confirmed by themselves, given the demand they have had on their Servers, those 72 hours have been converted into 120 Hs.
Therefore, they must now wait 120 hours before considering that they are facing a problem.
I thank you again for the support.