DAEMON_OPTIONS with Modifiers=A but still authentication attempts on port 25

Hi
I didn't know "Modifiers=A" existed until I came across this
   https://www.hydrus.org.uk/journal/sendmail-noauth.html
referencing a thread in
   https://groups.google.com/g/comp.mail.sendmail/c/c8x-bA07_d0
Since the discovery of "Modifiers=A" I have tried, yet the attempts are still coming in (duplicates deleted):
   Jan 9 12:28:13 mail saslauthd[1930]: : auth failure: [user=trangtry] [service=smtp] [realm=barrett.com.au] [mech=pam] [reason=PAM auth error]
   Jan 9 12:55:45 mail saslauthd[1933]: : auth failure: [user=business] [service=smtp] [realm=barrett.com.au] [mech=pam] [reason=PAM auth error]
   Jan 9 13:00:16 mail saslauthd[1929]: : auth failure: [user=barrykennedy] [service=smtp] [realm=barrett.com.au] [mech=pam] [reason=PAM auth error]
   Jan 9 13:27:53 mail saslauthd[1930]: : auth failure: [user=psf] [service=smtp] [realm=barrett.com.au] [mech=pam] [reason=PAM auth error]
   Jan 9 13:36:06 mail saslauthd[1933]: : auth failure: [user=scr] [service=smtp] [realm=barrett.com.au] [mech=pam] [reason=PAM auth error]
The important bits in the sendmail.mc file:
   define(`confAUTH_OPTIONS', `p')
   TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 PLAIN')
   define(`confAUTH_MECHANISMS', `EXTERNAL DIGEST-MD5 CRAM-MD5 PLAIN')
   DAEMON_OPTIONS(`Family=inet, Addr=101.0.102.2, Port=smtp, Name=MTA-barrett.com.au,     Modifiers=A')
   DAEMON_OPTIONS(`Family=inet, Addr=127.0.0.1,   Port=smtp, Name=MTA-localhost,          Modifiers=A')
   DAEMON_OPTIONS(`Family=inet, Addr=101.0.102.2, Port=smtps, Name=MTA-SSL-barrett.com.au, Modifiers=s')
versions:
cyrus-sasl.x86_64 2.1.27-6.el8_5
sendmail.x86_64   8.15.2-34.el8