How to individuals to a dynamic group (static)
1. Copy the name of the dynamic group exactly as shown in Active Directory.
2. Open Exchange Admin Center and search for the user.
3. On the user settings side panel, open "Others" then select Custom attributes.

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4. Paste or append the group name to custom attribute 01 (for Navigator Security Groups) and save.
For example, if there are already groups listed under attribute 01, then add a new group by using a comma as shown below:
NY Front Desk and House Calls, LA Front Desk and House Calls, FL Front Desk and House Calls, SF Front Desk and House Calls
The user will automatically be added to the dynamic group within a few minutes.