Hi, Philip321.
I'm Jen, I'm also an Outlook user just like you. I'm not working for Microsoft but I'd be happy to help you figure this out.
I understand you want to recall an email from your Outlook mobile app. Unfortunately, there is no option to recall emails both in-app and through web access. However, you can set up undo send in your Outlook.com settings to delay sending emails which give you enough time to cancel it in case you sent it to the wrong recipient. You can find the same info in the article I shared below.
https://support.microsoft.com/en-us/office/i-wa...
I hope this helps. Feel free to share how it went.
Kind regards.