Problem using CLI Secrets

I would like to be able to use a secret in a command like this:

vpn login --token op://personal/VPN-Token/TOKENS/Token1

But this fails ...

when i try the secret on its own I get a BASH error saying "no such file or directory"

I can access the item using op get item

Taking this information and constructing the secret in this format:
op://<vault-name>/<item-name>[/<section-name>]/<field-name>

Using this information from the get item output

Vault-Name = Personal
Item-Name = VPN-Token
Section-Name = TOKENS
Field-Name = Token1

I believe that the secret should be:

op://personal/VPN-Token/TOKENS/Token1

I also thought that I could use one of these, but I get the same error:

op://personal/VPN-Token/Token
op://personal/VPN-Token/Password

what have I missed?

1Password Version: 8.10.3
Extension Version: 2.16.0
OS Version: Linux Mint 20.3
Browser:_ n/a