Find your account number from you Bing Ads account main dashboard, top navigation bar Account drop-down.
Email your Bing Ads account number to integrations@sourcemedium.com
Wait for an email from Microsoft Ads with a request from SourceMedium to link to the account with Standard access
Click to approve the request using the hyperlink approve or reject this link request prompt under Next steps
Alternatively, you can find the approval link in your account from the top navigation bar > Accounts > Account Summary > Requests > click [!] Action Required and click Accept