Why did the Muslims of Andalusia in 756 accept the fugitive Prince Omayyad, proclaim him their ruler

Why did the Muslims of Andalusia in 756 accept the fugitive Prince Omayyad, proclaim him their ruler, and secede from the Baghdad Caliphate?

The Caliphate of the VIII century was a military association of Islamic armies that ruled over the countries they captured. The unity of the state was ensured by continuous trade along the traditional trade routes. In the East, the Silk Road flourished, but in the Mediterranean, trade was weak, so the revolution in Damascus caused the separation of Andalusia. The ruler Omai-yad was needed by the separatists as a banner in the struggle against the new Abbasid dynasty.

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