Try again after following the account that post. Having someone from your instance following a remote user is the best way to insure proper federation of content in the fediverse.

That may be a federation issue. Are both accounts on the same instance?

Fortunately, the current teenagers are much more aware of the danger than past generations. In my time, many teens thought parents just did not understand modernity and were panicking over nothing. The cyber-bulling and addiction to social media kept growing but at least the young generation has awareness.

I much as I want to introduce my family to the fediverse, I will not. Except for Mastodon maybe. Way to many creeps. Tech-savy, free-tech supporter creeps but creeps anyway. My parents did the same to me at a time when all my peers were into mobile phone and not like today’s kids realising how bad it can be. I turned out fine and more knowledgable about the technolgies I did choose to use than average. I wish my parenst have keep supervising me for one or two more years more.
Keep parenting.

Dommage pour toi (^_-)