Hi I purchased f secure safe for 1 home device instead of renewing through the my f secure account where it asked to renew for 3 devices. Now I cannot create an account to activate f secure safe as my email address is already in use.
Sorry for my reply.
And if you do not mean that your "email address" for My F-Secure Account just randomly in use (not by you with previous subscription)...
Most likely you have next options:
--> If you want to use your previous account/mail-address for fresh subscription:
Most helpful step can be direct talk with F-Secure Support channels like:
https://www.f-secure.com/en/web/home_global/support/contact-support - phone call;
https://www.f-secure.com/en/web/home_global/support/contact-chat - chat;
Maybe they able to handle situation.
Not sure if it available on weekends. If there is delay with get support by this channels: maybe you able to re-check your previous account with "order/payments"-tab, where can be places/buttons - where you able to add subscription license. Maybe it will be work (or maybe required remove previous subscription for three devices before this try).
--> If you able to create account with another (your) email address:
So just there will be fresh My F-Secure Account with "another" mail-address and with fresh subscription.
If just totally fresh/another mail-address not an option - maybe with some of mail-providers there possible to use something as "aliases" (where will be "different" address for service, but letters anyway will be related with your "main" mail address - with meanings that you do not create something additional as fresh credentials).