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Manuel BernalManuel Bernal 

About to enable Gmail auth via Okta - what happens to existing mobile clients?

Curious about the user experience once we enable Gmail auth via Okta SAML on existing iOS and Android devices? Will they be prompted to reauthenticate?
Raja NejemRaja Nejem (Okta, Inc.)
Users will authenticate with their existing passwords unless you update it through Okta.

Look at the Password Syncronization section in this guide:
https://support.okta.com/help/articles/Knowledge_Article/Google-Apps-Deployment-Guide
Srinivasa GayamSrinivasa Gayam
Are you defining any Network Masks when you configure Google with Okta?

User-added image

If masks are not defined (blank) then any new device enrollment (adding gmail account) will be redirected to Okta for authentication (first time). Devices that are already configured with gmail will not be impacted. 

If you have netmasks defined then for the defined netmasks it is same as above, for all other networks Okta doesnt come into play.

Keep in mind, once you integrate Google with Okta/SAML, none of the users can change their Google passwords (network mask rules doesnt apply here). They may need help for their admins in case if they need to change it for whatever reasons. You other option is the one that Raja mentioned above.