Suggestion

1. The field could validate and not allow white spaces when URLs are pasted there, maybe wiping them out automatically or informing the user, this can prevent misconfigurations as a white space character is enough to break the SAML integration.
2. An additional validation could be to check if the URLs provided are not the same for the Service Provider (Atlassian Entity ID and SSO URL) and inform the user, sometimes customers will be confused and add this information instead of the Identity Provider's information, this could prevent other misconfigurations.