Hello,
From what I'm understanding, it's nothing to see with the AAD Connect synchronization. But, your tenant has been disabled for synchronization. When you've a Tenant, the disabling of the Synchronization can take several days depending on its size. And then, if it's mistake and you need to re-activate it, it can take again several days (again). Happened with a customer a few months ago, that made a confusion on the 2 below commands :
Set-MsolDirSyncEnabled -EnableDirSync $false (stopping Tenant synchronization)
Set-ADSyncScheduler -SyncCycleEnabled $false (stopping AAD Connect synchronization)
So, when the status will have ended its "PendingDisabling" you should be able to re-activate it - if it's something you want to do.
It's important to not mis-understood : synchronization for the whole tenant and just stop/start the AAD Connect synchronization process.