The app is asking you to confirm all the funds but all the funds are coming from someone else's account.
Not to worry, you can add all of this to 'co-buyer' funds
How to add all the funds to 'co-buyer funds'?
Step 1: Tap on confirm my funds
| Step 2: Tap on 'Co-buyer funds'
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Step 3: Add the amount and press add
 | Step 4: If necessary, repeat the process until 'Confirmed funds' match the 'Funds required'
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Is it not moving to the next step?
Please check that your confirmed funds match the funds required.