Configuring store settings and product listings within Microsoft Merchant Center
Hello JonathanHirst1!
Thank you for reaching out to us!
I understand that you are in the process of creating a Merchant Center Store within your Microsoft Advertising account but have not been able to select your destination URL.
In order for a domain to be displayed at this stage of the setup process, we do require that the domain be validated by either Bing Webmaster Tools or a UET tag. After the domain is validated, you will be able to select the appropriate option. Information on how to complete this step can be found here.
If you have completed either of the validation methods and are still not seeing your domain, please do let me know and I will be more than happy to have this reviewed on your behalf.
Thank you,
Tatiana | Microsoft Advertising Support Specialist | 800-518-5689