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I would seek therapy if something like that bothered me. The tip is a good one though, calling out the partner’s name whenever they appear will help the child better identify who’s who.

Very simple when your child has two mamas. :)

LPT: don't be the kind of parent who is so self-centered that you get disappointed when your baby is learning how to mimic sounds of human speech that they may or may not even understand yet instead of just being glad that your baby is learning and growing and happy.

Doesn't make sense to get worked up over whether the child says mama or Dada first. It depends on what the child finds easier to say: https://www.care.com/c/do-babies-say-mama-or-dada-first/

It's not like the child will just talk to one parent for the rest of his/ her life.

Vocalizing depending upon muscle strength in the mouth and has nothing to do with you saying mama, dada to the infant. I don't know why more people don't know this.

The act of suckling strengthens lips, tongue which are what we use to vocalize. It turns out the easiest sound to make is 'ta', it only needs a little bit of tongue to do. The next sound is 'da' which requires a little more tongue work, but not much which is why statistically the first word out of a babies mouth is dada, it is easier to say. Making the sound 'ma' require lip strength. Lips muscles are hugely weaker than tongue muscles so 'ma' and 'ba' and 'pa' take longer to master for the baby.

Babies speak as per their physically development not so much what you train them to do.