[riddlemethat]

Fastmail doesn’t offer phone support for paid users.

I have an account with them and spent months troubleshooting a carddav sync issue with my two Mac computers before giving up and switching contacts over to iCloud.

Proton mail seems pretty hungry for business. I inquired for a paid plan and they follow up all the time with sales people who have unique email addresses.

[supercommand]

Interesting maybe try a fresh contact import on your macs? I know about 20+ people who use IMacs iPhones and MacBooks with fastmail and have no syncing issues.

[riddlemethat]

I used it for two years without issue.

Tried to export and reimport to no avail.