Message not sent: invalid destination address

It started when i first try to send an sms/mms to family a couple of months ago, i have the prepaid 15gb plan on a recently purchase pixel 6a, made sure sms app has all the rights it wants. the message i get when try to send is "message not sent: invalid destination address" i use the stock sms app that comes with android.  I have no issues sending or receiving sms/mms at all with another phone that i have an apple se (2020) on h2o wireless an att mvno on a pay as you go plan, sending to the same phone number in cuba.  any help would be appreciated.  thanks

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Customer Service Rep

Hi there! Let's have a closer look & see what may be happening! Please send us a Private Message, so we can proceed.