Sometimes if TMS is used to onboard several customer tenants in sequence you might encounter an error.
The errors/issues include problems with connecting a tenant, provisioning, and so on. An example error is shown below:
The error message in the above screenshot says: failed to init tenant
This type of issue has been seen when a tenant is provisioned, then another then another tenant, and then another, and so on. There is no hard number of successes before a failure may occur.
To work around this issue refresh (F5) the browser. Alternatively use incognito/private browsing mode when provisioning tenants.