Ask HN: Sites to ask UX and Architecture questions

I'm a solo developer working on integrating a Web app with Microsoft Teams. Recently I've been hitting some complexity with edge cases that have come up during Microsoft's testing (eg. they are using the same MS tenancy for different demo organisation accounts, so my app is merging those demo organisations since they share an MS tenancy).

What I have done is working, but I suspect it's overengineered or there's a more elegant solution.

Are you aware of any online communities to ask questions about UX and designing software to support multiple platforms?

I'm looking at ux.stackexchange.com now, but also interested in alternatives.