The user needs to be in 1 of the 2 branches listed. We’re using groups based on our (country-based) branches to define geographical regions, and it wouldn’t work otherwise. In the branch condition you should also see this phrase “Users will be included into the group according to the branch they belong to”, which indicates that users only need to be part of 1 of the branches that are added as critera.

If you’re not using the group for any automation yet, you can also easily test it since those conditions can always be edited and the platform adds/removes users instantly.

The way you have it now where the set mist have all conditions satisfied, the user would have to belong to both branches to belong to the group. You can create a set for each branch and change your rules to “user must satisfy at least one set but leave your set to, all conditions must be satisfied. This creates a “OR” relationship between the sets.