Can't get imessage to send in blue imessage only green sms

I have the above problem I have Sent A Test Message to my husbands iphone who receives imessages. I have done all the below steps can anyone help? thank you

the iMessage are not out of Out Of Order?

I have been to  Settings -> Messages and tap the button next to iMessage to turn iMessage off on your iPhone

I have held down the power button down until you see ‘Slide to Power Off’ and slide your finger across the bar to turn off your iPhone Turn device back on, head back to Settings -> Messages, and turn iMessage back on.

Make Sure iMessage Is Set Up Correctly

Head to Settings -> Messages and tap to open the menu item called ‘Send & Receive’. Here, you’ll see a list of the phone numbers and email addresses that are configured to send and receive iMessages on your device. Look under the section titled ‘Start New Conversations From’, and if there isn’t a checkmark next to your phone number, tap on your phone number to activate iMessage for your number.

Check Your Internet Connection

Remember that iMessage only works with a Wi-Fi or cellular data connection, so let’s make sure your iPhone or iPad is actually connected to the internet. Open up Safari on your device and try navigating to any website. If the website doesn’t load or Safari says you’re not connected to the internet, your iMessages won’t send either.

Hint: If the internet isn’t working on your iPhone, you might be connected to a Wi-Fi network that doesn’t have a good internet connection. Try turning off Wi-Fi and resending your iMessage. If that works, the problem was with Wi-Fi, not with iMessage.

4. Sign Out Of iMessage and Sign Back In

Head back to Settings -> Messages and tap to open ‘Send & Receive’.

Next, tap where it says ‘Apple ID: (your Apple ID)’ and choose ‘Sign Out’.Sign back in using your Apple ID and try sending an iMessage to one of your friends with an iPhone.

5. Check For An iOS Update

Head to Settings -> General -> Software Update and check to see if there is an iOS update for your iPhone. During my time at Apple, some of the most common issues I faced were problems with iMessage, and Apple routinely pushes out updates to address iMessage issues with various carriers.