Hello @Shivaji , Thanks for using Microsoft Q&A Platform.
Have you tried creating F0 tier with other resource region? May I know the resource region that caused this issue?
The free tier is limited per subscription and if you have already used free tier, you might receive this error: https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/azure-subscription-service-limits#azure-cognitive-services-limits
Please make sure that certain services are free for specified amounts https://azure.microsoft.com/en-in/pricing/free-services/
I hope this helps.
Regards,
Vasavi