Hello Joseph Hendrie.
Thank you for posting your query on Microsoft Q&A portal.
Either granular delegated administrative privileges (GDAP) plus an indirect reseller relationship or a delegated administrative privileges (DAP) relationship is required to onboard customers to Lighthouse. If DAP and GDAP coexist in a customer tenant, GDAP permissions take precedence for MSP technicians in GDAP-enabled security groups. Customers with GDAP-only relationships (without indirect reseller relationships) currently can't onboard to Lighthouse, but will be able to onboard in a future release.
Overview of permissions in Microsoft 365 Lighthouse: https://free.blessedness.top/en-us/microsoft-365/lighthouse/m365-lighthouse-overview-of-permissions?view=o365-worldwide
Obtain granular admin permissions to manage a customer's service: https://free.blessedness.top/en-us/partner-center/customers/gdap-obtain-admin-permissions-to-manage-customer
Also please share us the details asked in the Private message if you need further assistance.
Thanks,
Suchitra.