Steps to reproduce:

1) Open Unity Hub and create a new URP Template project
2) Switch platform to Android
3) Make sure that Gles2 is the only Graphics API
4) Switch color space to Gamma
5) Enable HDR on all URP assets
6) Build and Run project on a device
7) Observe error spammed in the logcat:
Failed to create RenderTexture with RGBA16 SFloat (48) format. The platform doesn't support that format, and it doesn't have a compatible format.
Also screen will be rendered in grey.

Reproduced with:
2020.1.0b2 - URP 9.0.0-preview.4
2020.2.0a4 - URP 9.0.0-preview.4

Not reproduced with:
2020.1.0b2 - URP 8.0.1

Devices under testing:
Reproduced with:
VLNQA00126, Samsung Galaxy S5 Mini, CPU: 4x Cortex-A7 @ 1.4GHz, GPU: Mali-400 MP

Not reproduced with:
VLNQA00217, Razer2, CPU: Snapdragon 845 SDM845, GPU: Adreno630, OS: 9.0.0
VLNQA00268, Galaxy S10+, CPU: Exynos 9 9820, GPU: Mali-G76, OS: 9.0.0
VLNQA00010, Galaxy S8, CPU Snapdragon 835 MSM8998, GPU: Adreno 540, OS: 7.0.0
VLNQA00093, Galaxy S6 Edge, CPU Exynos 7 Octa 7420, GPU Mali-T760
VLNQA00270, Samsung Galaxy S10e, CPU: Exynos 9 9820, GPU: Mali-G76
VLNQA00292, iPad Air3, SoC: A12, iOS: 13.2.3

P.S. Download URP 9.0.0 from https://github.com/Unity-Technologies/ScriptableRenderPipeline