The Problem is the correct key is not being imported run:
Blockquote
wgethttps://www.expressvpn.com/expressvpn_release_public_key_0xAFF2A1415F6A3A38.asc
(the forum wont let me place a URL even if it is needed for the command so had to get creative after the first word in the command “weget” just add a space)
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gpg --import expressvpn_release_public_key_0xAFF2A1415F6A3A38.asc
respectively to get the correct keys
found the problem on the AUR page of ExpressVPN.