Does the old `sector identifiers` work after migration? I think it should work.
In 4.3 to later, no option to add any new sector identifier from gluu server. Instead, you can create a `JSON URI` at SP side or anywhere which should consist the list of `redirect uri` and add that `JSON URI` to the **Sector URI** box of the OpenID Connect section. That's how it works now.
An example of `Sector URI`: [https://raw.githubusercontent.com/imShakil/test/master/uri](https://raw.githubusercontent.com/imShakil/test/master/uri)
For more details you can read [this](https://docs.google.com/document/d/1-IDB572uzHjFdBiSpr79gApm1SpidC_MjU99--OkIs8) note which is curated from our Developers.
Regards ~ Shakil