GPG key could not be added by apt-key on Ubuntu 20.04

I can not add the gpg key for apt repository into keychain. But I can add it through the gpg --import When I try to add it with apt-key add, it just doesn't appear there, and I get no obvious error: curl -sSL https://deb.********.com/pubkey.gpg | apt-key add - gpg: key 8D81803C0EBFCD88: "Docker Release (CE deb) " not changed gpg: key 7C3D57159FC2F927: "InfluxData Package Signing Key " not changed gpg: key 1285491434D8786F: "Dell Inc., PGRE 2012 (PG Release Engineering Build Group 2012) " not changed gpg: key D8FF8E1F7DF8B07E: doesn't match our copy gpg: key 3B4FE6ACC0B21F32: 3 signatures not checked due to missing keys gpg: key D94AA3F0EFE21092: 3 signatures not checked due to missing keys gpg: key 871920D1991BC93C: 1 signature not checked due to a missing key gpg: Total number processed: 8 gpg: skipped new keys: 4 gpg: unchanged: 3 Then I check the key with apt-key list, and it is still not there. I noticed this behavior, when my ansible playbook stopped working (because it can't add the key with apt_key module). Any thoughts ?