Colour rule for multiple buttons in a complex platform

I'm currently designing a CRM which includes a lot of forms and modules. I have been struggling to decide the colour rule for the buttons especially having to incorporate branding colour into the palette.

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Current Scenario

Context: Form to register New Student

Blue

  • Usage: Main button

  • Example: 'Submit' button to submit the form

  • Issue: Blue seems more natural colour for the main button and links so I select it as the main button

Teal (Brand colour)

  • Usage: Secondary button

  • Example: 'Upload student image' & 'Add Subject' button

  • Issue: Since blue stands out more than teal I have selected teal as the secondary button, but the secondary button appears more often than the main button.

White

  • Usage: to pair with the main button
  • Example: 'Save as draft' button

How do I create a rule as to when to use the colours or is it better to just use 2 colours(teal and white)? However, there are many buttons and links in the CRM, so I feel that having 3 colours can help distinguish them better. What are your thoughts?

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