Waiting 90 seconds for propagation...
Testing again...

MAIL FROM: 250 2.1.0 Sender OK
RCPT TO: 250 2.1.5 Recipient OK
DATA: 354 Start mail input; end with <CRLF>.<CRLF>
Result: 250 2.6.0 <37058590-19c1-44de-bca6-d2dbb7def6c8@CH2PEPF00000099.namprd02.prod.outlook.com> [InternalId=168616121081176, Hostname=SA1PR02MB8351.namprd02.prod.outlook.com] 9210 bytes in 0.146, 61.285 KB/sec Queued mail for delivery

Still accepted. The rule may need adjustment.

Try checking:
1. Rule is set to "Enforce" mode (not "Test")
2. Rule priority is 0 (highest)
3. No other rules are overriding it