White screen when signing in VIA SSO

[Rusty19]

We currently use the Zoom integrated app for outlook so that users can create Zoom meetings on their IOS devices. However when they attempt to sign in some users get a white screen after signing into the 365 SSO page.  I can't recreate this on a test device i have. SSO works fine otherwise. I can sign in via SSO on desktop apps, my test iPad, and on the website. Has anyone ever seen an issue like this?