SAML Redirect Loop Occurs When Signing In With Safari On iOS

When signing in with SAML authentication by Safari on iOS, after the user submits valid credentials (username and password) to IdP, the user is stuck in a redirect loop between IdP and Tableau Server.




Additionally, the vizportal logs (set to debug mode) contain the following message:
2020-07-07 17:22:18.011 +0900 (-,-,-,XwQwuuMrQ32x-9sz4swDSgAAAf8,5:-53c415fc:1732820e438:-7c08) catalina-exec-10 vizportal: INFO  com.tableausoftware.app.vizportal.LoggingInterceptor - Request received: /v1/getSessionInfo
2020-07-07 17:22:18.012 +0900 (-,-,-,XwQwuuMrQ32x-9sz4swDSgAAAf8,5:-53c415fc:1732820e438:-7c08) catalina-exec-10 vizportal: DEBUG com.tableausoftware.api.webclient.WebClientApiController - WebClient API: Request for method 'getSessionInfo' received
2020-07-07 17:22:18.012 +0900 (-,-,-,XwQwuuMrQ32x-9sz4swDSgAAAf8,5:-53c415fc:1732820e438:-7c08) catalina-exec-10 vizportal: WARN AuthNResponse- No xsrf header was found in request.
2020-07-07 17:22:18.012 +0900 (-,-,-,XwQwuuMrQ32x-9sz4swDSgAAAf8,5:-53c415fc:1732820e438:-7c08) catalina-exec-10 vizportal: INFO  com.tableausoftware.api.webclient.remoting.AuthenticatedUserCallInterceptor - WebClient: called API method has parameter of IAuthenticatedUser type, but when called there was no logged in user. Responding with 'InvalidSessionException'.
2020-07-07 17:22:18.012 +0900 (-,-,-,XwQwuuMrQ32x-9sz4swDSgAAAf8,5:-53c415fc:1732820e438:-7c08) catalina-exec-10 vizportal: DEBUG com.tableausoftware.core.util.RemoteIP - Found header https in X-FORWARDED-PROTO
2020-07-07 17:22:18.012 +0900 (-,-,-,XwQwuuMrQ32x-9sz4swDSgAAAf8,5:-53c415fc:1732820e438:-7c08) catalina-exec-10 vizportal: INFO  com.tableausoftware.api.webclient.WebClientApiController - com.tableausoftware.domain.exceptions.InvalidSessionException: Session not found. (errorCode=46)

Cause