Hello,
It likely isn’t being blocked by anything in your mailbox settings. This looks more like a rejection happening on Microsoft’s side, before the message is even delivered to you.
Microsoft has been tightening enforcement around email authentication. If the sender’s domain is missing or misconfigured SPF, DKIM, or DMARC, Microsoft may start by delivering messages to Junk (a soft failure) and, if the issues continue, escalate to outright rejection (a hard failure), where messages from that sender may not reach Microsoft mail users at all.
I checked the sender domain’s authentication, and it shows problems, so the fix needs to come from the sender. They will need to correct their SPF and DKIM setup and publish a valid DMARC policy, then retry sending once their domain passes authentication checks.