Sending of emails via MailChannels from my worker had stopped to work. (I have correct settings of T

Sending of emails via MailChannels from my worker had stopped to work. (I have correct settings of TXT records). Did anything change in the integration https://blog.cloudflare.com/sending-email-from-workers-with-mailchannels ? I get the 401 Authorization Required response when I want to send an email.
The Cloudflare Blog
MailChannels has created an email sending service specifically for Cloudflare Workers that removes all the friction associated with sending emails.
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