Checked my mailbox and the destination wallet. Nothing there. Participation id was 104451 and verified the URL I have bookmarked was correct one.

Unfortunately, I cannot find your message. Please send the message again with participation id in subject.

Sent another message.

We haven't received it. Did you send it to coinmixer@protonmail.com?

Okay. That's the address but for some reason it's not coming through then. Sent now from protonmail.com.

Got it resolved. Thanks.