Frozen Breastmilk & Feeding

Anyone have a problem with getting baby to eat thawed out, heated, frozen breast milk? I’ve been building up a stash for my return to work next month and decided to have baby try some today. She refused to drink it. I was a able to get her to drink 1 oz but she was not liking it. I had to toss 4 oz 😭 Any tips, advice or websites recommendations? TIA

FTM feeling kind of bummed 🙁

Update:

2nd day, this morning at 6:30am I feed her 1oz frozen with 2oz fresh and she did much better. It took her about an hour, but she finished it. I did the same at 10:00am and 1:00pm and she finished those as well. Now I’m back to breastfeeding her for the rest of the night.

Tomorrow I plan to do 50/50 2oz of each. She is more of a 4oz baby so that is my next goal. Thanks for all the advice I’m feeling much better today.