: I have the following chord progression. But not scale exists. Is this okay? I have the following progression (using F-minor scale): Cmajor > D# Sus2 > A# sus2 > F sus2 > D# Sus2. Initially, the Cmajor was a Cmin...but I

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No scale (I could find) contains those chords.

Well, one scale that definitely contains those chords is the chromatic (12-tone) scale. You're free to use all those notes in whatever way you want!

It's also likely that there's a way to see your progression in terms of diatonic scales too, if that's important to you. But to answer your question directly, If you like the sound of something, it's okay.

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Write the enharmonic equivalents of D# and A# (=Eb and Bb).

Then you have the progression V-bVII-IV-I. Eb is a borrowed chord of f-minor. (As the other chords are are sus4 we even don’t know whether they’re major or minor. But if you are soloing in f-minor, it will be f- minor - or you have blue notes in mind ...).

Is this o.k.?

Every pthing is o.k. that sounds fine.

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If your root note is C, you could play the flamenco scale. Basically phrygian with an added major 3rd.
If your root note is F, you can use a mix of harmonic and melodic minor.
Anything is ok if you like the sound, there is no music police who will arrest you ;-)

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If you are basing your harmony off of F minor, this chord progression makes a lot of sense especially wanting to use C major instead of C minor. This is very rooted in the traditional study of harmony by weaving though the 3 minor scales which are F natural minor, F harmonic minor, and F melodic minor which gives the following sets of notes:

F natrual minor - F G A♭ B♭ C D♭ E♭ F
F harmonic minor - F G A♭ B♭ C D♭ E F
F melodic minor (asending) - F G A♭ B♭ C D E F

This is a very common scenario when dealing with minor keys and is very traditional in nature. I suggest reading up more on the different types of minor scales to get a better grasp on how they are used:

Understanding minor key harmony
Why are the harmonic and melodic minor scales called what they are?

As a closing note, not everything needs to be contain in one scale and you'll find a lot of the more colorful progressions venture pretty far outside of just one set of scales that defines them.