Short answer is no.

So don't listen to the help desk nitwit that only answered the first part of your question as they all seem to do for some dumb reason...

Multi-user mode doesn't work for any Previous years if 2022 Data Base Manager is installed and they don't seem serious to fix it, Just show me the money!!!!!

What they fixed in that investigation was the 64 bit Data Base Manager not installing originally. The installer would install a 32 bit DBM that didn't work for any versions including 2022 and ironically still exists in the installer package which is why they have to give such long detailed instructions on how to properly install it to make it function for 2022 only.

They wont even open a new case on this and it was like pulling teeth to get any of the QB tech guys to acknowledge that the issue exists.

Some of the other IT guys in this thread and my self have tested this 10 ways to Friday. No Go.

The only way to keep previous versions of the QB software's Multi-user mode functioning is to not install the 2022 Data base manager at all or uninstall it if its installed.This means all previous years will be able to open in Multi user mode but 2022 will not.

It would be nice to pay so much money for software and have it not kill other version of supposedly "Supported" software.... But that's Soooo 2010......