If you don’t have automated signatures on your email account, you may need to add it manually to each device you send email from. If you have a fairly elaborate signature, it’s perhaps easier to copy and paste it from an existing email.
This guide uses images from Outlook on iOS but should be very similar if not identical on Outlook for Android.
- Find an example in your sent items that has the signature you want, select, and copy.
- Go to Settings
- Scroll down to Signatures. You can set one signature for all accounts if you have more than one, or you can set it per account (I would recommend doing it per account, especially if you have both work and personal accounts on your device)
- Paste the signature into the relevant signature box. There is no save button, just click to return to the normal Mail view.