Hi @Arun Nair
Thank you for reaching Microsoft Q&A.
If you are using the Conditional Access Policy for MFA, create a group for the Service Users and exclude the group in Conditional Access Policy.
Before excluding remove the user or group from the existing policy under the Include users.
Once you have modified the policy, your service users will be able to bypass the MFA.
If you don't have the Conditional Access Policy create a new Policy and include the users or group who are need the MFA and exclude the users or group who are not need the MFA.
Hope this helps. Do let us know if you any further queries by responding in the comments section.
Thanks,
Akhilesh.
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