In order to assign Permission Set to multiple users, try the below AppExchange tool,
https://appexchange.salesforce.com/listingDetail?listingId=a0N3000000B4GsTEAV
Cheers!!!
Sample Screenshots:
Cheers!!!
https://appexchange.salesforce.com/listingDetail?listingId=a0N3000000B4GsTEAV
Cheers!!!
Sample Screenshots:
Cheers!!!