Authentication failed same providere

[DomenicoFormoso]

Hi everyone,
I can't find where I'm going wrong because in one case it works fine:

 using (var ClienteImap = new ImapClient())
 {
         await ClienteImap.ConnectAsync("imaps.pec.aruba.it", 993, true);
         await ClienteImap.AuthenticateAsync("[email protected]", "XXX");

Connected to imaps://imaps.pec.aruba.it:993/
S: * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE AUTH=PLAIN AUTH=LOGIN AUTH=OAUTHBEARER AUTH=XOAUTH2] IMAP ready.

but in this other case it doesn't work:

using (var ClienteImap = new ImapClient())
{
        await ClienteImap.ConnectAsync("imaps.aruba.it", 993, true);
        await ClienteImap.AuthenticateAsync("[email protected]", "XXX");
 

Connected to imaps://imaps.aruba.it:993/
S: * OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ AUTH=PLAIN] Dovecot ready.

error: {"Authentication failed."}
in MailKit.Net.Imap.ImapClient.d__6.MoveNext() in MailKit.Net.Imap\ImapClient.cs: riga 421
MailKit 4.11.0
Blazor project .Net 9.0

[jstedfast]

The only explanation is you provided incorrect credentials.

[DomenicoFormoso]

the password contains only ascii characters

[jstedfast]

Get a protocol log and take a look to see what might be wrong.

new ImapClient(new ProtocolLogger("imap.log") { RedactSecrets = false })

[DomenicoFormoso]

Hi, jstedfast thank you for your time.
This is the log:

Connected to imaps://imaps.aruba.it:993/
S: * OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ AUTH=PLAIN] Dovecot ready.
C: A00000000 AUTHENTICATE PLAIN AGFjcXVpc3RpQGlzZXR3ZWIuY29tAElzZXRXZWIxMTEx
S: A00000000 NO [AUTHENTICATIONFAILED] Authentication failed.
C: A00000001 LOGIN [email protected] zzz0000 
S: A00000001 NO [AUTHENTICATIONFAILED] Authentication failed.

The authentication credentials are the correct ones also in the log.

[jstedfast]

Time to email the company that hosts your email account and ask them for help.

[DomenicoFormoso]

The problem was caused by my imap service provider. I apologize for taking your time.