Embed using the form URL
Press the “Share” button for your form in Microsoft Forms
Copy the form link from the Share screen
Note: Do not check the “Shorten URL” checkbox
Paste the URL into the Confluence editor
If needed, change the width and height of the macro
Publish the Confluence page
...
Embed using the macro editor
Edit the Confluence page
Type /microsoftforms and hit enter
Add the embed URL and if needed, change the width and height of the macro
Publish the Confluence page