How To Transfer, Combine, & Share Amex Points

Several years ago I was pretty successful in transferring points from my wife's AMEX account into my name of a partner airline or hotel. I would always start with 1k points, see if it took, and then transfer the rest. A few months ago I tried transferring points from her AMEX account into my Flying Blue account. A week went by and the 1k points didn't transfer and still havent. So 1k points lost.... (then I realized that Flying Blue has Family Accounts anyways so i was able to transfer them into her Flying Blue account, and then into my Flying Blue account)

I’ve used the authorized user for years to get hubby’s MR transferred to my airline accounts. It’s a bit tricky in that while my AmEx accounts are all ‘Bill Crews’ (member since 1983) and airlines will linkup to my ‘William’ accounts, I have to be sure I’m ’Willian’ as an authorized user on Hubby’s cards
If your are not in a hurry to add wait for the offer to earn MR points adding the authorized user
BTW sending this from the Louvre Abu Dhabi after flying Etihad from IAD for 115,000 AA miles. Monday I fly to LHR in the Apartment then on to FRA for 62,500 AA miles

re Transfering points to an authorized user's loyalty account. Getting divorced and this seems like a way around the inability to split up AmEx points. If someone had to transfer half of their many, many AmEx points into one of your loyalty accounts for future use, which loyalty program would you use for the most flexibility for use in future hotels, flights, etc?

This is a comment on an old post, I know, but I'm hoping Ben or someone who knows might still see this.

"simply add all of your accounts to a single online log-in, and then you’ll automatically see your points total for all of your accounts listed there." This did not happen for my Wife's account.

Sometime in the past year we successfully combined all her Amex cards/account into one single online log-in but it seems her Amex MR Points are still separated by card. She has something like 227,000 tied to one Amex Biz Platinum & Biz Gold card and then she has another 201,000 tied to a different Amex Bix Platinum card for a different business. ALL cards show under her single login, though.

Is there a way to get all these points combined? We're not crazy about paying 3x $895 for our 3 Biz Platinum cards (including mine) so will probably cancel at least one of hers. We don't want to lose those points, though.