Tap Settings gear > View all Outlook settings > Compose and reply.
Tap inside the Email signature box and tap Paste.
Tap Save. Your signature will sync to the Outlook app automatically.
⚠️ Note: The Outlook Android app does not support pasting a formatted signature. Use Outlook.com in Chrome instead — signatures sync automatically to the app.
Enter your details and tap "Copy Signature for Outlook".
A new Chrome tab opens with your signature. Tap and hold the signature, then tap Select All > Copy.
In that same Chrome tab (or a new one), go to outlook.com and sign in.
Tap Settings gear > View all Outlook settings > Compose and reply.
Tap inside the Email signature box, long-press, and tap Paste.
Tap Save. Open the Outlook app — your signature will be there.