Can't grow EFI partition on GParted Live USB

Originally the EFI partition was 100 MB. I was able to move 400MB unallocated space into the partition but I cannot actually resize/grow the partition. Can you please help?

256GB SSD:

/dev/sda1 fat32 /boot/efi flags: boot
/dev/sda2 ext4 linux mint
/dev/sda4 ext4 xubuntu

Thanks!

Copying the log below:

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GParted 0.23.0 --enable-online-resize

Libparted 3.2

Check and repair file system (fat32) on /dev/sda1  00:00:00    ( ERROR )
       
calibrate /dev/sda1  00:00:00    ( SUCCESS )
       
path: /dev/sda1 (partition)
start: 2048
end: 1026047
size: 1024000 (500.00 MiB)
check file system on /dev/sda1 for errors and (if possible) fix them  00:00:00    ( SUCCESS )
       
fsck.fat -a -w -v /dev/sda1
       
fsck.fat 3.0.28 (2015-05-16)
Checking we can access the last sector of the filesystem
Boot sector contents:
System ID "MSDOS5.0"
Media byte 0xf8 (hard disk)
512 bytes per logical sector
1024 bytes per cluster
6654 reserved sectors
First FAT starts at byte 3406848 (sector 6654)
2 FATs, 32 bit entries
393728 bytes per FAT (= 769 sectors)
Root directory start at cluster 2 (arbitrary size)
Data area starts at byte 4194304 (sector 8192)
98304 data clusters (100663296 bytes)
63 sectors/track, 255 heads
2048 hidden sectors
204800 sectors total
Reclaiming unconnected clusters.
Checking free cluster summary.
/dev/sda1: 26 files, 38956/98304 clusters
grow file system to fill the partition  00:00:00    ( ERROR )
       
using libparted
libparted messages    ( INFO )
       
GNU Parted cannot resize this partition to this size. We're working on it!
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