Hi, not sure if related, but some firewalls, e.g. Sophos XG declares the pgp key as malware:
2018-04-26 09:41:13Malwaremessageid=“08001” log_type=“Anti-Virus” log_component=“HTTP” log_subtype=“Virus” status="" fw_rule_id=“1” user="" web_policy_id=“13...
