[Seaside] iOS redirect / rendering problem

[Bob Nemec]

We're having a problem with physical iOS devices (works fine on Chrome virtual device) where a final Seaside redirect is not happening after an Azure SSO redirect. I'd like to understand what triggers the Seaside redirect: I can see it in normal rendering, but I've never had to dig into it like this before. 
When I log from a non-iOS device I see...1: WAApplication>>handleFiltered: application URL  - self requestContext redirectTo: 'https://login.microsoftonline.com/...'   - redirects back to our app URL with an access token2: WAApplication>>handleFiltered: application URL with MS access token & no _s & _k values   - validate token with Azure   - save user info in new WASession   - finish render3: WAApplication>>handleFiltered: application URL with _s & _k plus callback values like: &2=2160&1=3840&3=false   - WAResponse>>location: application URL with _s & new _k and no callback values 4: WAApplication>>handleFiltered: application URL with _s & _K   - finish render  With iOS step 3 does not happen; I'd like to know what triggers it normally. 
Just to add to the fun, we have a two WAApplication registered. The default application fails on iOS, the other works fine. I can see no obvious difference between the two. 
Thanks for any help (I'll cross post on the the Seaside mailing list and Discord)
Bob Nemec

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