Periodic Office 365 SMTP Send Error Due to TLS 1.1/1.0

We have PHP web application that sends SMTP emails via authenticated smtp.office365.com. This has been working for at least a couple of years.

We are using PHP Mailer 5.2. We are forcing the crypto_method to STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT.

Here's the weird thing. About 75% of the time it works fine. The rest of the time it reports SMTP ERROR: Password command failed: 421 4.7.66 TLS 1.0 and 1.1 are not supported. Please upgrade/update your client to support TLS 1.2.

Registered Stream Socket Transports is tcp, udp, unix, udg, ssl, sslv3, tls, tlsv1.0, tlsv1.1, tlsv1.2

How is it even possible that it works most of the time. If it were truly a TLS issue I'd expect it to fail 100% of the time.

source https://stackoverflow.com/questions/70353208/periodic-office-365-smtp-send-error-due-to-tls-1-1-1-0

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