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I’m currently having this same problem on the profile pages; the page meta titles are missing, so every page meta title is just our website name. We also use Yoast.
Sounds like this is a result of bbPress creating virtual pages for every user that can’t be customized or noindexed to improve SEO.
The forums, topics, replies meta titles are fine because we’ve set them in Yoast > Settings.
I came across other bbPress forum topics that mentioned the BBP Improvements for Yoast plugin and a few other plugins to improve bbPress and Yoast, but the plugins are 4-6 years out of date, so I’m not going to install them. There’s also a Github topic about this, but it was closed in 2021 with only vague ideas of workarounds, for example using an API-based noindex coding.
I’ve already reset permalinks and flushed cache.
I’m planning to update WP Core and update our PHP version to see if that helps.
There’s also a button in Yoast tools to “Start SEO Data Optimization” which I may do lastly.
