Seems to be fixed.
The cert for eu.wildfire.paloaltonetworks.com is now the same like for wildfire.paloaltonetworks.com.
Last night wildfire.paloaltonetworks.com was valid until 5/11/2020
I had to change the WF config to wildfire.paloaltonetworks.com last night because of warning email every minute was filling my mailbox.
Have switched back to eu.wildfire.paloaltonetworks.com now and errors are gone.
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