Re: Power Apps Portals custom code
I am bit confused with the answer by @v-xida-msft
"If you want to use your Dynamics 365 CRM Portal 8.3 within PowerApps Portal directly, I afraid that there is no way to achieve your needs currently"
The community portals 8.3 is still valid for D365 online: https://github.com/Adoxio/xRM-Portals-Community-Edition
Now.. bear in mind that this wouldn't be my recommendation, in the last Release Notes, Microsoft announced finally a date for the deprecation of WS-Trust and OrganizationServiceProxy (April 2022)
So you can be sure that after April 2022 any on-prem Portals still pointing to a D365 Online instance will stop working
I am not sure if the community is planning to upgrade the source code, to be honest there would be a lot of work involved, so my guess would be probably not!
My recommendation would be to get your most complex pages from your ADX 7.5 and give it a try on an online trial Power Apps Portals, see how far you can get and if that suffice your needs
If you feel you wouldn't have time to re-write everything in liquid/javascript, I would migrate to v8.3 at a first instance.. but consider to migrate every code to Liquid in the future
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