Migration from ESA to UC mixed age couple

I have been trying for nearly 3 months to get help to migrate online. To visit our home & do these migration forms. I contacted several organisations inc CAB Help to Claim on the migration letters. But to no avail.
I rung UC explained our situation:
My husband had a stroke & as recently been diagnosed with stage 4 lung cancer which as spread. Hes undergoing treatment awful side affects, sleeps all day, no appetite, nausea & vomiting. His mobility is very bad & as to be wheelchaired from home to the Marsden.

I broke my my back some years ago & during rehab suffered Sudden Sensorineural Hearing Loss, which left me deaf, I have 40% vocal clarity in one ear. This sudden loss as caused brain damage & I have many side effects.

I rung UC to see if they could help & send someone down & was told no.

So finally today I found a local carers centre who is sending someone on the 18th June to do forms.
My questions are:

Its a joint ESA claim, but my husband is 71 & gets state pension which is reduced from the ESA. I am the younger & main claimant & added him to my.claim. We both get SDP, carers premium as we care for each other full housing benefit & both get PIP. Council tax as now changed to getting 95% instead of 100%.

My questions:

1. Are mixed age couples like us harder to migrate

2. The only time I could get someone to fill in these migration forms is the 18th June, my next ESA is the 19th June. Will this cause a problem. My deadline is 21st June.

Thank you for any replies. I dont know how to get email notifications when someone answers, so will just keep checking in.

Not sure if my first reply went thru? So aoplogies if you this reply.
I have been ringing that number, but they will only do over the phone claims & not visits.
I did try calling them today re the 2 questions about mixed age couple & the dates on my original message to you. But each time I rung Help to Claim was a message saying busy call back. I did try several times, hence my message on here.