How to enable php-mbstring and php-soap on my Ubuntu 18.04 droplet

Running WordPress w/WooCommerce on a Ubuntu 18.04 droplet with PHP 7.4.2.

A WooCommerce Square payment add-in is not accepting payments.

The WooCommerce website status is reporting 2 errors:

Your server does not support the mbstring functions - this is required for better character encoding. Some fallbacks will be used instead for it.

Your server does not have the SoapClient class enabled - some gateway plugins which use SOAP may not work as expected.

Both php-mbstring and php-soap are installed.

A php -i | grep soap command returns:

/etc/php/7.4/cli/conf.d/20-soap.ini,
soap
soap.wsdl_cache => 1 => 1
soap.wsdl_cache_dir => /tmp => /tmp
soap.wsdl_cache_enabled => 1 => 1
soap.wsdl_cache_limit => 5 => 5
soap.wsdl_cache_ttl => 86400 => 86400

A php -i | grep mbstring command returns:

/etc/php/7.4/cli/conf.d/20-mbstring.ini,
Zend Multibyte Support => provided by mbstring
Multibyte decoding support using mbstring => enabled
mbstring
mbstring extension makes use of "streamable kanji code filter and converter", which is distributed under the GNU Lesser General Public License version 2.1.
mbstring.detect_order => no value => no value
mbstring.encoding_translation => Off => Off
mbstring.func_overload => 0 => 0
mbstring.http_input => no value => no value
mbstring.http_output => no value => no value
mbstring.http_output_conv_mimetypes => ^(text/|application/xhtml\+xml) => ^(text/|application/xhtml\+xml)
mbstring.internal_encoding => no value => no value
mbstring.language => neutral => neutral
mbstring.regex_retry_limit => 1000000 => 1000000
mbstring.regex_stack_limit => 100000 => 100000
mbstring.strict_detection => Off => Off
mbstring.substitute_character => no value => no value

I was told by WooCommerce support the line:

mbstring.encoding_translation => Off => Off

Is the problem.

I do not know how to fix or troubleshoot this problem. Thank you in advance for any help you can provide!