Since your return is being rejected with a message saying "You have an entry on Form 8283, Donee Acknowledgement which required a donee's signature, electronic attachment is not supported," you will need to print out and mail your tax return.
The taxing agency has implemented new standards for 2024 tax returns that essentially says if Form 8382 has a noncash donation where the donee is listed, then the form must be signed.
Please follow the steps here to print and file your tax return.