email saying my account needs my attention

It says activate now to unlock the full potential of your subscription.

All your activation codes in one place

Easy in-app logins to activate

Convenient subscription info

Don’t miss out! Activate your free account now.
Your Avast Team

I already have a paid account.

I haven’t seen anything like this in the forum (I could well have missed it)
Presumably you have activated your paid version ?

Have you logged in to your my.avast.com account ?
If not it may well be worth doing so and see that your license is, A) present and B) assigned to your paid installation.

What paid avast version do you have ?

Is the email actually from Avast? hover over the link to see website that is pointing to.