@HIiAMLOGAN
Have you followed all these steps?
Go to Settings (Preferences on Mac).
Click Browser in the sidebar.
Under Synchronization, click the Advanced Configuration button.
Under Encryption options, select Encrypt all synchronized data with your own sync passphrase.
Enter you desired passphrase, confirm the phrase, and click OK..
A year and a half later, on Opera Version:101.0.4843.43, and still, pinboards in my laptop and desktop do not sync... this feature is awesome, but it needs a fix...
@leocg thanks for the nudge that it is known. I've been going back and forth between Opera and Firefox because of that when i get frustated. I didn't found anything specific regarding this, at least not something new (after 2019), so i've decided to post it.