dual boot – installation failed with no space left on efi partition

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Trying to do dual boot with windows 10.
Already installaed win10.
Doing manual partitioning using the existing efi partition.
Installation gives the following error.
Both installation media and laptop are gpt/uefi.
Secure boot is turned off in bios.
Drive is nvme.

cannot copy /usr/lib/grub/x86_64-efi-signed/grub64.efi.signed to /boot/efi/EFI/ubuntu/grub64.efi': No space left on device

Checked the partitions via gparted and EFI System partition shows Size:625MB, Used:95MB, Unused 0.00MB.
I think the error is because it shows 0MB unused space.

I didn’t understand why it shows 625MB space and used 96MB but 0MB unused space.
Any help is appreciated.

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