.SendUsingAccount problem

I am using a loop to identify the account integer of an email address I want to send an email via.

The loop identifies the correct email address to use

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The above returns 4 which is the correct email account

When I try both either of the .SendUsingAccount commands below to send the email, it gets sent from the default (account 1) rather than the specified email address

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Any help with this would be fantastic!

TIA