Try just changing licenses on Office365...

[Alan Baker]

I work for a client who went independent after having worked for a
company with Office365 and he's joined a new company which also has
Office365.

So I worked with him to switch the licensing of his copy of Office from
the old company to the new.

And lo and behold: there's a button called "Change License" on the
"File"/"Account" panel.

Only... ...it doesn't work.

Click the button to Change License for Office, and you get prompted for
user and password...

...but it then tells you:

"The products we found in your account can't be used to activate Word."

Except I KNOW this client was licensed for Office365 Business Premium.

It took calling Microsoft technical support and getting them to tell me
about a series of command line instructions that had to be executed to
unlicense Office and then I was able enter the new Office365 account
information.

Further, upon trying this same procedure on a virtual machine I run for
another client who actually has two tenancies (for legal reasons) and
from whom I have a license for Office365 Business Premium that we're
switching from one tenancy to the other, I also ran in to the nonsense
about it asking me if I wanted to let my organization manage my device.

After telling it "NO", it went ahead and added my machine to their Azure
domain anyway.

This business of connecting devices and trying to create "single
sign-on" (sort of) is completely broken.

[Thomas E.]

THAT is a major issue. When I switched from buying Office direct from Microsoft to Go Daddy it took an hour on the phone with Microsoft Tech Support and an ungodly complicated set of commands to make it happen. All to save about $20 a year on a 3 year Go Daddy special rate on the license.