Where do I find the Certificate info for Office 365 that I am using

We use Office 365 exchange, one of our partners is requesting certificate info like,
Who issued the certificate being used
What cipher is being used
What encryption strength is being used by the server

Where do I find that info?

I've gone around in circles looking at articles from Microsoft and not found the answer.  Where do I find that?

Appreciate the help
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With O365 u r presented with front-end only which is common for all public tenancy and it's secured with 2048 bit SSL certificate, hence entire communication is secured with SSL and TLS technology, this is enough and you can showcase / explain to your partner.
u don't need to look at how Microsoft manages their cert
jem lianCommented:
Log a new service request from Support in O365 Admin Center. O365 support will be able to provide the certificate details.
Adam BrownSr Solutions ArchitectCommented:
If you're looking for this information for compliance purposes, be aware that O365 complies with all major regulatory compliance systems already and you only need to provide the appropriate documentation from MS to meet your compliance requirements. The necessary documentation can be found from the O365 admin portal under Security & Compliance > Service Assurance > Trust Documents
If you haven't already set your region and industry, do so under Security & Compliance > Service Assurance > Settings. Once that's done, the necessary trust documents for your company's industry can be generated and everything you will need to provide for compliance purposes can be obtained through the Trust Documents page.

Edit: For information, Information on O365's encryption standards is available in the Encryption document under Trust Documents

More Edit: Or you can go to http://aka.ms/Office365CE to download the document directly

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Vasil Michev (MVP)Commented:
If they need this information in order to enforce mutual TLS with O365, you will find the relevant details in this article: https://support.office.com/en-us/article/how-exchange-online-uses-tls-to-secure-email-connections-in-office-365-4cde0cda-3430-4dc0-b489-f2c0736c929f
c7c4c7Author Commented:
Jem Lian, all ready tried that.  Their response was to read the documents, mentioned by Adam Brown

I've included that document in the response to our business partner, thanks for everyone's help
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