Hi @animo , Thanks for using Microsoft Q&A Platform.
If you are using a Standard pricing and your Concurrent request limit is 100. You might be receiving this issue.
If you would like to increase the limit, raise a support request by following these guidelines: https://learn.microsoft.com/en-us/azure/cognitive-services/speech-service/speech-services-quotas-and-limits#create-and-submit-a-support-request
Please refer to this documentation to know more about the quota and limits: https://learn.microsoft.com/en-us/azure/cognitive-services/speech-service/speech-services-quotas-and-limits#detailed-description-quota-adjustment-and-best-practices
I hope this helps.
Regards,
Vasavi
-Please kindly accept the answer and vote 'yes' if you feel helpful to support the community, thanks.