You can only select a personal, current account as your main account to link with Plum (e.g. you can’t use a joint, business account, or a credit card as your main account).
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To switch main accounts, go to the Linked Accounts list on the Homepage, select the account you’d like to use, and then tap ‘Make Main Account’.
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When switching your main account, we’ll need to cancel your existing Direct Debit mandate and create a new one for the new Main Account.

This means it may take an additional 2–3 days for your next saving to be made, before falling back into the usual pattern.