Referring to this endpoint
https://auth0.com/docs/api/authentication#get-code-or-link
The validation regexp is here
https://auth0.com/docs/api/authentication#post-passwordless-start
"String does not match pattern: ^\\+[0-9]{1,15}$"}
Could the regexp be changed so that the leasing + is optional? Seems arbitrary given that the required string length is 1…15.