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It's normal but you need permission. The client needs to agree to it and it's not unreasonable for them to change their minds.
For purposes like getting more work, of course you can talk about your work - what you did and what the outcomes were - to potential buyers of your services. This is reasonable.
Biging up your role to the point where you've (self? or been?) nominated for an award - that is public - seems like overreach, based being asked to write a press release. This is unreasonable, especially if permission wasn't sought or granted.
I don't really want to defend the Ingram-Moore folks, but I'm not sure how folks could get that wound up about them 'taking credit' for the services of a freelancer.
It's literally how freelancing works - you do the work, you get paid. That's kind of it.
Unless it's not freelancing, in which case, pay yo' fucking taxes!
Read like the kind of article published in the Sun's 'serious pages' in the 90s. But it gets irate eyeballs, so.