Yes, a confirmation request can be sent without a Letter of Authority.

When creating the confirmation request, you have the option to either send an LOA or sign the request individually:

Note that the client will have to sign the request individually.

1. Select Sign Request Individually 

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2. You can now select which client signer(s)  that you wish to sign the request. Note that you will only be able to select a maximum of 2 signers.

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3. Select Save to send the request to the Draft section.

4. Select Send to Client

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5. Once the client has signed the document, it will be sent to the Signed section and can be completed from there.