Enforcing Email Verification with SAML

I followed
https://community.auth0.com/t/best-practice-of-enforcing-email-verification/115088/1
and it works. Its SAML with Atlassian.
Only in case the email is not verified I get instead of Please verify your email before logging in. this error:

“{“key”:“badRequest”,“context”:{“message”:“Invalid customer saml login callback request”,“reason”:“does not contain at least one assertion within saml response”}}”
URL: id.atlassian.com/v2/customer/login/saml/callback?connection=saml

SAML login fails with "Invalid issuer in the Assertion/Response" | Jira and Jira Service Management | Atlassian Support says to that error:
"After setting up SAML with Jira Data Center, the user is redirected to Jira but is not logged in. "

How can I configure this case in auth0?