"Help me write" icon not displayed despite Gemini enabled

[jnl_jkl]

Hi all,

I'd like to test the Gemini in Looker feature, in particular the Formula assistant - however, despite all pre-requirements mentioned in this link (https://support.google.com/looker-studio/answer/14196955?sjid=13630294189043056830-EU#zippy=%2Cin-th...) are satisfied, i cannot see the "Help me write" icon in the field editor (see screenshot below)

Any advice on what could be the root cause and help me troubleshoot this issue? Thank you very much!