Hi Narendra
If you have a hybrid environment and the group is available in AD, You can use the OOB activity "add user to group" from the Microsoft AD spoke.
If it is purely 365, you would most likely need to create a custom action in flow designer and run powershell to connect to the cloud and do it.
to do so you need a service account that has the appropriate roles in exchange.
then you need to set up a connection alias in servicenow with those credentials
then in your custom activity, you will need to specify that "credType" is "AD" as an input variable, and pass through the values you need for your ps script.
e.g.
this example is for giving a user permission to a shared mailbox, but the principal is the same.
then all you need to do is write your powershell, something like:
import-module ExchangeOnlineManagement
connect-exchangeonline -credential $cred
Add-DistributionGroupMember -Identity $mailbox -Member $user
from experience, it's worth evaluating the output for errors - otherwise the step will always show as successful even if it doesn't work. it will return it's data through the output, you can just scan for phrases and assign them to error codes like so
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