What version of TellMeWhen are you using?
9.0.4

What steps will reproduce the problem?

1. Use the following DogTag in any label: [StripServer(Unit:Name)]
2. See that it returns: "Unknown tag: TMWName"

What do you expect to happen? What happens instead?
Usually, it shows the unit's name with the server/realm name stripped. Has been working like this for many weeks.

Screenshots and Export Strings
https://imgur.com/a/HvLYkIc

I apologize for the lack of title, not intentional.

Thanks, this was fixed in be71393.