Not receiving emails from Adobe Sign when client signs the document

I am experiencing an ongoing issue where confirmation emails from Adobe Sign (e.g., completed signature notifications) are not being delivered to my domain email.

1. SPF, DKIM, and DMARC are all properly configured on my DNS via Hostinger.
2. MX Toolbox shows my DMARC record is published and valid.
3. SPF record includes:
   v=spf1 include:spf.protection.outlook.com ~all
4. DKIM for Microsoft 365 is enabled and valid under Exchange Admin Center.
5. I have created a mail flow rule in Exchange Online to bypass spam filtering for all emails from adobesign.com, setting SCL to -1.
6. Nothing is found in Microsoft Defender Quarantine, and message traces show no record of incoming messages from adobesign.com.
7. I confirmed that adobesign@adobesign.com is added to my allow list and address book.

I have attached the image that shows in the Adobe Signature activity where it clearly states that the email has been bounced when Adobe tried to send me a email. Please note that I do receive emails from any other source and can easily send email to clients without any problem.

Please help resolve why emails from Adobe Sign (specifically from adobesign@adobesign.com) are being rejected or not delivered to my domain. If there is anything else I need to whitelist or configure differently, please advise.