Copy and paste not working

Hi; I'm using a Protonmail alias. When I copy my Hide-my-alias address in Protonmail using the Copy icon, the popup says Alias copied to clipboard it doesn't paste. Not sure if this is a Proton or FF issue. Looks like it's mot being copied. More info: Using Firefox I clicked on my new HideMyAddress alias address, clicked on my alias copy icon, says copied. It won't paste into the address field of a new email. Clipboard History is enabled. I can paste any History entry but not the alias I copied using the copy link next to the alias link. To copy it to clipboard, I have to : Open all alias' Sign back into account Highlight the alias address, copy Then it will paste Tested with Brave browser: Logged into Proton.me Copied alias and pasted into new email To address, it works. Thanks for any ideas.