Are you absolutely certain that your husband has done this? The reason I ask is that actually putting someone on the mandate as a signatory is not easy and requires passport or driving licence and proof of residence before the bank will add someone.
However even if you are a signatory, it doesn’t give you any liability and you also don’t have to sign anything so I’m not certain what the problem is.
If you can tell you what your concern is, I can expand my answer for you.
Can I clarify anything else for you?
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The thread remains open. We can still exchange emails.
Best wishes. FES.