Search for username on a Password list
We are also looking for this feature. Is there a formal feature request for it somewhere?
Multiple, separate sessions/tools vaults with one shared credential vault?
>> Regarding using credentials or sessions across multiple vaults, sadly it is not possible.
Therefore it sounds like the answer to the original question regarding "one common credential vault shared across each of their current sessions/tools vaults" is "no".
When additional teams were acquired, the previous RDM administrator (manager of the teams) had separated the sessions into separate vaults. As I discovered and you explain, the Password Lists will need to be in the same vault. Thanks for the clarification.
Multiple, separate sessions/tools vaults with one shared credential vault?
>> Currently each team is setup with a separate vault within the data source. ... would like to use one common credential vault shared across each of their current sessions/tools vaults.
I tried this but was unable to get it to work. When I try to reference the credentials in the shared credential vault from the separate session vaults, the credentials don't show up in the drop-down "Credentials" dialog box, only "Prompt on connection" appears. I was only able to get it to work by duplicating (just a small subset of the whole tree in the credentials vault so far) into (just one so far of) the separate team vaults.
>> Yes it is possible using the Role Base Security System.
We are using the Role Based Security System.
We are using RDM version 2020.1.20.0 64-bit
Sorry, but after spending a good bit of time yesterday and this morning trying to get this to work, I was unable to get the separate team sessions vaults to successfully reference the common credential vault. Of course, you can give the _users_ of the separate team vaults permissions to access the "common credential vault", but that doesn't seem to give them a way to use the "common credential vault across each of their current sessions/tools vaults."
@NOTWJ1836 - Were you able to get this to work yourself using the suggestions provided by @epoirier?
Only the credentials in the same "separate" vault appear in the "Credentials" drop-down box. The ones in the "one common credential vault" which is being attempted to be "shared" with the sessions vaults do not appear there.

Override Credentials in User Specific Settings keep getting lost
It's a SQL Server data source, shared by others, but the User Specific settings aren't shared of course. I was looking in the RDM database to see if I could see anything there that I could watch and see exactly when it happens. There was an update today, but I had noticed the issue before applying the update. I'm pretty sure the database isn't getting manually restored or anything like that, but haven't been able to identify any specific trigger.
Override Credentials in User Specific Settings keep getting lost
Every two or three weeks, all of the User Specific Settings disappear and I wind up having to re-do the Override Credentials (https://help.remotedesktopmanager.com/index.html?edit_userspecificsettings.htm), using credentials from my Private Vault. Just trying to figure out what might be causing the settings to go AWOL so often. Any ideas?