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Hello,

Weird one guys... so I created an account on the 25th SEP and posted a few posts, all were other people's content but I have prior consent to use and post them. I was also boosting the posts for a day or two to get some quick likes on a new page.
Instagram are now rejecting my photos and I have zero clue why, I have had this issue before... no bad photos, no trademarks etc.

Any tips? Would really appreciate any assistance, thanks!

Instagram Ads run only on eligible posts. I had same sort of issues: I tried to promote posts as soon as I posted, IG halted the ad so the solution was to wait a day or two and run ads. I might be different for you.
You should check out Instagram Eligibility Requirements for your post and trobleshoot your problem.