Remove Usergroup If User In Different Usergroup

[JesseUCAVedYou]

I'm looking for either an addon or method to keep users from being in multiple user groups out of a list of specific user groups.
I'm using a Discord integration addon that syncs roles between my forums and Discord.
In my Discord server there are tier roles, Tiers 1 - Tier 10 based off of how many messages a user has sent in the server.
On the forums I have created corresponding roles and told the Discord addon to sync the roles from the Discord server to the forums.
I noticed today that a user on the forums had both the Tier 2 and Tier 3 user groups as they apparently got promoted in the Discord server.

I need to ensure that on the forums a member is only in one tier group at a time.
Since it is being done via a Discord addon I'm certain the user group promotions wouldn't work.

Any suggestions?

 

[beerForo]

Group promotion does this

 

[JesseUCAVedYou]

Group promotion does this

How when the promotion is done via Discord?

 

[beerForo]

The corresponding role.

 

[JesseUCAVedYou]

The corresponding role.

I don't follow how if an addon is the one assigning the usergroups.

 

[Paul B]

The core software can remove members from one user group if they are promoted to another using the "is not a member of" criterion.

You will need to contact the Discord add-on developer for assistance to ensure it works with the core code correctly.

 

[beerForo]

Thank you for explaining. I didn't mean to be vague but was posting from mobile.

 

[JesseUCAVedYou]

The core software can remove members from one user group if they are promoted to another using the "is not a member of" criterion.

You will need to contact the Discord add-on developer for assistance to ensure it works with the core code correctly.

I don't follow.
If I create a promotion for let's say Tier 3, and set the criteria to "is not a member of" the other 9 Tier groups wouldn't everyone automatically get Tier 3 when they sign up to the site?