Attempting to delete a Service Mesh form the HCX manager UI using the Service Mesh force delete option may fail
HCX
The Service Mesh entry may not be deleted even when the force delete option is used. This is the result of failed configuration workflows such as manually deleting the HCX manager and appliances from the remote site.
Be sure to follow the documented procedures to remove HCX:
Uninstall HCX deployment from Connector & Cloud
If the issue you are having matches this KB article, please provide the following details when opening a case with Broadcom support.