Windows 10: Can't Join or Delete Homegroup

I have a 3 PC ("Server" and two others) home network.
On my Server, OLDLOCALUSER created a Homegroup in Win7.
I upgraded all 3 PCs from Win7 to Win10.
On my Server, I changed my OLDLOCALUSER to NEWMSACCOUNT.
I also created NEWMSACCOUNT on the two other PCs.
I lost the Homegroup password.
When I try to access the Homegroup from Server or the other 2 PCs, I'm told that OLDLOCALUSER has already created a Homegroup.
How can I remove the Homegroup or join the Homegroup?
I would like to use the Homegroup.

Thanks,
Pete

:)

 

Unable to exit from/join to the HomeGroup.

Original title: Homegroup

I can't join or leave my existing homegroup.

I can't delete the existing homegroup. It tells me that the user I'm using is the administrator, but it won't let me get to the homegroup to either show the password of the existing homegroup or to delete it.

I tripple checked every computer that is showing on my network list as connected, but neither of the computers is on the homegroup.

HOW can I get rid of the existing homegroup? Or make it possible for my computers to join that homegroup?

 

Can't delete old homegroup, can't create new homegroup, can't join a homegroup, multiple homegroups, this is much harder than it should be

I have 2 computers on the network.

Each has the option to join a different homegroup.

I can't delete either existing homegroup

and I can't create a new homegroup.

What do I do?