Focus share greyed out

Hey there,

Please make sure the following are enabled:

1. Settings > Focus > Share Across Devices is enabled
2. Settings > Privacy > Focus > Messages is enabled
3. Settings > Messages > Focus also displays as enabled

If you're using any other devices signed into the same Apple ID, make sure they have the same settings. Let us know what you find, and we'll go from there.

More info on using Focus can be found here ☞ Use Focus on your iPhone, iPad, or iPod touch - Apple Support

You may get better and prompt responses if you may kindly provide the iPhone Model that you have and the iOS version if it is known to you and re-post.

With the limited information that you have provided, It is hard to even guess the problems faced by you. 

You may get faster and better responses to your query by --> Writing an effective Apple Support Commun… - Apple ...

Please re-post with detail so that someone else can help.