How do I delete a Distribution List that is synced with an On-Premise AD, but that Distribution List cannot be found anywhere on the On-Premise AD?

Question

1 - I have a Distribution List(AllStaff), that is synced with an On-Premise AD Server

2 - When I checked the two On-Premise AD Servers for the Distribution List(AllStaff), it cannot be found anywhere

3 - * I am not sure if the the Distribution List(AllStaff) was synced with another On-Premise AD Server that died, and no more exists, before I took up this job.

4 - HOW CAN I FORCE DELETE THE the Distribution List(AllStaff) FROM M365/AZURE?

THIS IS WHAT I GET IN M365/AZURE:

You can only manage this group in your on-premises environment...

Answer 1

You can use the good old MSOnline module to force the deletion:

Remove-MsolGroup -ObjectId blabla

Do note that if the group is indeed synced from on-premises, it will be recovered/recreated after next sync, so double checks things therein.