You cannot do a consolidation request from a 0x01 source validator to a different 0x01

[remyroy]

From what I understand, you cannot do a consolidation request from a 0x01 source validator to a different 0x01 target validator. The source and the target validator must be the same for an in-place upgrade from 0x01 to a 0x02 validator or the target validator must be a 0x02 one. This is currently possible through the dora UI and it will show in the consolidation requests tab on a validator's page.

See https://github.com/ethereum/consensus-specs/blob/dev/specs/electra/beacon-chain.md#new-process_consolidation_request

    # Verify that target has compounding withdrawal credentials
    if not has_compounding_withdrawal_credential(target_validator):
        return

[remyroy]

In short, when you select your target validator in dora UI for the consolidation request, it should either be the same as the source validator or one that is of 0x02 type.