Less tech savvy people - better to use a separate authenticator app? (NOT a discussion about data security per se)

I just want to start with: this is about the easiest way to onboard less tech savvy people and not about the security pros and cons about bundling your TOTP with your passwords. This is a topic that's been discussed extensively and it's not what this is about!

So I have a mission this holiday season to get my parents trained up in using a password manager. I've struggled to teach them even basic stuff....trying to setup an Apple TV over the phone took ONE HOUR. Yes, this is the level of technological sophistication I'm referring to.

I don't think the username / password part will be the most challenging. It's TOTP's where I expect to struggle.

Anyway, for the longest time I assumed using TOTP's in Bitwarden would be the best way to ease them in - having it all there in one spot...of course that's better, right? But I'm having second thoughts, because I'm going to have to install a separate authenticator app anyway for their Bitwarden TOTP. Right away, I can see this being confusing. "Get your 6 digit code from here....but....for the other 6 digit codes, go there instead"....uhhggghhhh, I can already feel how painful this will be.

Am I over thinking this? Anyone else encountered the same challenge?