Adaptive card not Displaying on teams mobile

Hi Griffin1235, found two possible ways Teams card can fail on mobiles while ok on desktop:
1) Having an empty image url (I used Power Automate and in my case the link may be null)

{
  "type": "Image",
  "size": "medium",
  "url": "@{variables('LinkToImage')}"
}

2) Duplicate 'title' fields for 'Action.Submit' - as shown below, look for duplicate '"title": "Submit"',  change one of them to 'Submitxyz', see if it's fixed.  Not sure if this is explicitly not allowed in the Adaptive Card doc.

"actions": [
  {
    "type": "Action.Submit",
    "title": "Submit"
  }
]

I'm using card v1.4

It seems that the desktop Teams is more forgiving while the mobile clients are a lot more sensitive.  Also same case as some of you above, my cards worked for some time then one day it stopped showing.  The result of a Teams client update probably.

HTH,

GDB