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OPNsense 24.1.5_3-amd64

Please be kind - I'm still very new to linux.

I've managed to work through the first few steps of increasing the size of my boot partition from 8GiB to 20GiB.

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gpart show da0 outputs

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    40 41942960 da0 GPT (20G)
    40   532480  1  efi (260M)
532520     1024  2  freebsd-boot (512K)
533544 41409456  3  freebsd-ufs (20G)
Which appears to me to be correct.
However the OPNSense Dashboard still shows an 8GiB volume.

From what I understand, my next step is to run

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growfs /dev/da0p3
This prompts me to type in "yes" which I do, and then it returns

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Operation not permitted

How can I fix this?  Thank you.