Error 1014 - CNAME to Cloudflare Load Balancer

I have a Cloudflare Load Balancer with DNS my-lb.domain1.com and wanted to point a CNAME record on a different CF account app.domain2.com to my LB. However, this fails with Error 1014

I own domain1.com, but I have no access to domain2.com as it is client's domain.

I know i have to contact CF support to remove restrictions, but is there any othe alternative?
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