Basically, I feel DP has to make a lot of accommodations for me and it makes me feel guilty/that I’m not a good partner. I’m finding it hard to not feel crap about it currently.
What does DP say about it all?
It sounds to me like you're being really hard on yourself and seeing your diagnosis as meaning that any miscommunications are your responsibility to clear up, as if you're somehow defective. An equal relationship between two people means that both should shoulder the burden of communication equally. So don't feel bad that they have to make accommodations too - they're doing it for the privilege of being in a relationship with you because they want to be in relationship with you (the whole you, including the fact you have an autism diagnosis).
Everyone has to work at communication in relationships, and the advantage of your issue being ND vs NT communication styles is that there is heaps of guidance out there nowadays and lots of strategies for better communication. So it's a pretty easy solve compared to other possible communication issues a couple could have.
I appreciate it can be jarring being diagnosed late (I was too) and it takes some time to process it all, but you're the same person you were before your diagnosis and you're not deficient in any way, so try to work on your self-esteem and stop feeling guilty.
Remember - the only reason you feel it's on you to make more effort is because NT people are, by definition, the statistical norm. But in your relationship, there are just two people, so the NT/ND mix is 50:50. You're equals. Could it be that the fact DP makes such an effort feels weird to you because generally in life it's down to you to conform to NT expectations and people don't tend to make the accommodations that a loving partner might make?