Win 2019 IIS PHP 7.4 Oracle 12c connection issues

So my set up is

Windows 2019 std server
IIS plus CGI add on
Web Platform Installer
PHP 7.4 installed via WebPI
Oracle 12c 64bit client

Website loads
simple phpinfo shows PHP up

Connection to Oracle via our web app not working

Error in logs…

[02-Jun-2020 12:13:15 UTC] PHP Warning: PHP Startup: Unable to load dynamic library ‘php_oci8_12c.dll’ (tried: C:\Program Files\PHP\v7.4\ext\php_oci8_12c.dll (The specified module could not be found.), C:\Program Files\PHP\v7.4\ext\php_php_oci8_12c.dll.dll (The specified module could not be found.)) in Unknown on line 0

php ini exert…

[WebPIChanges]
error_log=C:\Windows\temp\PHP74x64_errors.log
upload_tmp_dir=C:\Windows\temp
session.save_path=C:\Windows\temp
cgi.force_redirect=0
cgi.fix_pathinfo=1
fastcgi.impersonate=1
fastcgi.logging=0
max_execution_time=300
date.timezone=Europe/London
extension_dir=“C:\Program Files\PHP\v7.4\ext”

[ExtensionList]
extension=php_mysqli.dll
extension=php_mbstring.dll
extension=php_gd2.dll
extension=php_gettext.dll
extension=php_curl.dll
extension=php_exif.dll
extension=php_xmlrpc.dll
extension=php_openssl.dll
extension=php_soap.dll
extension=php_pdo_mysql.dll
extension=php_pdo_sqlite.dll
extension=php_imap.dll
extension=php_tidy.dll
extension=php_oci8_12c.dll

php_oci8_12c.dll is confirmed in the C:\Program Files\PHP\v7.4\ext\ folder

If I run SQL plus I can talk to the Oracle 11 back end server. So the client appears to be working in itself.

Any ideas how I get it working please?

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